Schematic · n.d.

E-85289 / AH-85289 Linefinder Test Circuit for Switch Test Stand

Circuit explanation and adjustment for AE's bench test stand that exercises a linefinder out of the shelf; model for bench-testing switches.

Author: Automatic Electric Co.
Year: n.d.
Type: Schematic
Credit: Telephone Collectors International (TCI) Library, telephonecollectors.info (retrieved via Internet Archive Wayback Machine)

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- o l . r u I - . . - r - ~ CIRCUIT EXPLANATION LINEFINDER TEST CIRCUIT FOR SWITCH TEST STAND H-85289 (VJxitteu specifically for circuit issue 9 JC b u t may also apply to lzter issues. Refer io I3 print ior appropriate E issue numl~er.) Noc u p d a t e d f o r NAFM f i g u r e s . FEATURES P r o v i d e s means f o r t e s t o f v e r t i c a l o r r o t a r y s t:pping (b) P r o v i d e s means f o r t e s t i n g e i t h e r l o o p o r b a t t e r y access (c) P r o v i d e s means f o r t e s t i n g 100 o r 200 l i n e Line Finders (d) P r o v i d e s means f o r t e s t i n g t h e numerous c o n t i n u i t y checks v i a l e a d s t o t h e assoc i a ted jacks i n the Line Finder Rote: I f no s p e c i a l l i n e , bank o r normal p o s t s p r i n g i s i n d i c a t e d a f t e r e a c h T e s t No (X) , t h a n no l i m i t a t i o n s a r e a p l i c a b l e ; however when s o i n d i c a t e d , a s T c s t No (X) f 2 0 0 l i n e s ] , t h e n T e s t (X) i s o n l y a p p l i c a b l e t o 200 l i n e L i n e F i n d e r s . C I R C U I T CPERAT ION The S w i t c h T e s t S t a n d i s p r e p a r e d f o r t e s t i n g by conn e c t i n g exchange b a t t e r y and ground t o t h e e x t e r n a l b i n d i n g p o s t s BAT. a n d GRD. A. FIGS 1, 2 , and - 3 (NAFM) 1: J a c k i n g t h e f i n d e r i n t o t h e s w i t c h t e s t s t a n d l i g h t s t h e ATE lamp, i n d i c a t i n g c i r c u i t c o n t i n u i t y w i t h i n t h e f i n d e r from s w i t c h j a c k t e r m i n a l s p r i n g s , BVSY KEY, 1 3 t h r o ~ q , l ic o n t a c t s o f t h e V.O.N. r e l d y B, a n d r e l a y A . XO. -TEST --- TEST XO. 2 : O p e r a t i n g t h e f i n d e r b u s y k e y m o m e n t a r i l y c r z n s f e r s g r o u , ~ d rrom s w i t c h i a c k t e r m i n a l 1 3 t o s w i t c h j a c k t e r m i n a l 9 , e x t i n g u i s h i n g t h e ATB lamp a n d l i g h t i n g t h e GUARD lamp. This checks t h e breakmake s p r i n g c o m b i n a t i o n o f t h e b u s y k e y . -2 TEST S O .-- 3: - R a i s i n g t h e s w i t c h s h a f t opens t h e ground c i r c u i t t~ s w i t c h j a c k t e r m i n a l 1 3 a n d laces g r o u n d on s w i t c h j a c k t e r m i n a l 9 , e x t i n g u i s h i n g t h e ATB 1an:p a o d l i g l - ~ t i n gt h e GUARD lamp. T h i s c h e c k s b r e a k a n d icake c o n t a c t s o f t h e V . O . N . s p r i n g s . TEST KO. 4 : O p e r a t i n g t h e RELAY D k e y p l a c e s g r o u n d on s w i t c h j a c k t e r m i n a l 3. I n l i n e f i n d e r 75311, o r e q u i v a l e n t , groucd a t s w i t c h j a c k t e r m i n a l 3 causes r e l a y A t o operate. Relay A i n o p e r a t i n g t r a n s f e r s g r o u n d from s w i t c h j a c k t e r m i n a l 1 3 t o s w i t c h j a c k t e r m i n a l 9 , e x t i n g u i s h i n g t h e ATB lamp and l i g h t i n g t h e GUARD lamp. T h i s c h e c k s t h e c i r c u i t c o n t i n u i t y from s w i t c h j a c k t e r m i n a l 3 t h r o u g h c o n s p r i n g s , r e l a y B , and r e l a y D, t a c t s o f t h e V.O.N. a n d t h r o u g h t h s ill w i n d i n g o f r e l a y A . I n o t h e r l i n e f i n d e r s s u c h a s H-35738, o r e q u i v a l e n t , ground a t s w i t c h j a c k t e r m i n a l 3 i s extended through t h e f i n d e r t o switch jack terminal 9 without t h e intermediate operation of a r e l a y . In these finders t h e GUARD lamp l i g h t s , b u t t h e ATB lamp w i l l r e m a i n l i t , i n r e s p o n s e t o t h e o p e r a t i c n o f t h e RELAY D lcey. C o n t a c t s c h e c k e d a r e s i m i l a r t o t h o s e d e s c r i b e d i n t h e preceding paragraph. - TEST N 3 . 5: O p e r a t i n g t h e START key p l a c e s g r o u n d on switch j a c k t e r m i n a l 8 , c l o s i n g t h e c i r c u i t t o r e l a y I3 i n t h e f i n d e r . R e l a y B o p e r a t e s , t r a n s f e r s %round from s w i t c h j a c k t e r m i n a l 1 3 t o s w i t c h j a c k t e r m i n a l 3 , e x t i n g u i s h i n e t h e .4TB lamp and l i g h t i n g t h e C GRI). lavp, and closes a high r e s i s t a n c e c i r c u i t t o t h e SET,. SEIZE 1-amp from s w i t c h j a c k t e r m i n a l 2 , t h r o u g h c o n t a c t s of r e l a y B , through t h e i/2 non-inductive w i n d i n g o f r e l a y D , t o s w i t c h j a c k t e r m i n a l 1. 'TEST NO. 6 : Touching t h e b a t t e r y - c o n n e c t e d t e s t prod t o VERTICAL w i p e r and t o e a c h C w i p e r l i g h t s t h e t e s t l?mp, i n d i c a t i n g c o n t i n u i t y from e a c h o f L IL I C S L ~v ~ i l ) e ~ c is~ r o u g hc o n t a c t s o f r e l a y B t o s w i t c h j a c k t e r m i n a l s 1 9 , 5 , and 1 5 , r e s p e c t i v e l y . t11c L TEST NO. 7 : --- C p e r d t i n g t h e VERT. INT. k e y c l o s e s t h e c i r c u i t t o i 7 S . Kclay VS o p e r a t e s and c l o s e s c i r c u i t s ( a f t e r t h e r c l c a s e o f t h e VERT. INT. k e y which s h o u l d be h e l d o p e r a t e d only momentarily) o v e r s w i t c h j a c k t e r m i n a l s 4 a n d 14 ( l e a d s VERT. and INT.) t o s t e p the s w i t c h V I r t i c a l l y u n d e r c o n t r o l o f t h e VERT. magnet i n t h e l i n d e r and INT. r e l a y i n t h e s w i t c h t c s t s t a ~ - , d . ( F i g . 2 o r F i g . 3 on H-85289 w i l l be s e l e c t e d i n a c c o r d a n c e w i t h t h e REMARKS i n TABLE A on c h a t c i r c u i t d r a v i n g . ) The s l o w - t o - r e l e a s e t i m e o f r e l a y VS a l l o w s t h e s w i t c h t o t a k e f i v e o r more v e r t i c a l s t e p s b e f o r e V S r e s t o r e s and o p e n s t h e stepping c i r c u i t s . I n checking t h e v e r t i c a l stepping s p e e d , t h e r e p a i r m a n ' s judgment o f smooth o p e r a t i o n i s r e l i e d upon. C o n t a c t s checked by t h i s t e s t a r e t h e i n t e r r u p t e r s p r i n g s on b o t h t h e VERT. and ROT. magnets and two s e t s o f make c o n t a c t s on r e l a y B. TEST NO. 8: O p e r a t i n g t h e RELAY A k e y opens t h e c i r c u t t t o t h e C GRD. lamp, e x t i n g u i s h i n g t h i s lamp, a n d p l a c e s ground on s w i t c h j a c k t e r m i n a l 1 8 , c l o s i n g a c i r c u i t t o t h e # I winding of r e l a y A . Relay A o p e r a t e s and p l a c e s ground on s w i t c h j a c k t e r m i n a l 9 , l i g h t i n g t h e GUARD lamp. TEST NO. 9: O p e r a t i n g t h e RELAY D k e y p l a c e s g r o u n d on s w i t c h j a c k t e r m i n a l 1 7 , b u t r e l a y D i n t h e f i n d e r d o e s n o t o p e r a t e b e c a u s e t h e c i r c u i t t o i t s #1 w i n d i n g h a s b e e n opened by a s e t o f b r e d k s p r i n g s a t r e l a y A . T h i s t e s t v e r i f i . c s t h a t t h e s e b r e a k s p r i n g s a r e open w i t h r e l a y A operated. TEST NO. 10: O p e r a t i n g t h e ROT. INT. k e y e x t e n d s -ground from t h e i n t e r r u ~ t e rs ~ r i n n si n t h e f i n d e r . o v e r s w i t c h jack t e r m i n a l 1 4 , - t o F e l a y INT. ( F i g . ' 2 on 11-85289).- R e l a y INT. ( ~ i 2~ o.n l y ) o p e r a t e s , and t h e f i n d e r r - ~ o u l ds t e p r o t a r y , b e c a u s e o f t h e p r e s e n c e o f ground on s w i t c h j a c k t e r m i n a l 1 0 , ( F i g . 2 o r F i g . 3) e x c e p t f o r t h e f a c t t h a t t h e o p e r a t e d r e l a y A i n t h e f i n d e r h a s opened t h e c i r c u i t t o t h e ROT. magnet. T h i s t e s t v e r i f i e s t h a t t h e s e b r e a k s p r i n g s a r e open w i t h r e l a y A o p e r a t e d . TEST NO. 11: R c s t o r i r g t h e START k e y removes t h e m - l ~ s w i t c h j a c k t e r m i n a l 8 which o p e r a t e d r e l a y B i l l t h e f i n d e r . R e l a y B r e s t o r e s and o p e n s t h e c i r c u i t t o t h e SEL. S E I Z E lamp. R e l a y A r e m a i n s rperated, indicating t h a t i t s locking c i r c u i t t o switch jack t e r m i n a l 3 i s c l o s e d . 2 Shorting t h e upper l i n e wipers l i g h t s t h e SEL,. S E I Z E lamp, i n d i c a t i n g c o n t i n u i t y from s w i t c h j a c k t e r m i n a l s 1 and 2 t h r o u g h two s e t s o f make cont a c t s on r e l a y A i n t h e f i n d e r . T 0 -S.----- TEST NO. 13: Touching t h e b a t t e r y - c o n n e c t e d t e s t l a m p p r o d t o t h e u p p e r C w i p e r l i g h t s t h e t e s t larnp. Ground p l a c e d on s w i t c h j a c k t e r m i n a l 3 by t h e o p e r a t e d REIAY A k e y t o h o l d r e l a y A o p e r a t e d i n t h e f i n d e r i s e x t e n d e d t h r o u g h two s e t s o f make c o n t a c t s cn r e l a y A t o t h e u p p e r C w i p e r , t h e r e b y c o m p l e t i n g t h e c i r c u i t t o t h e t e s t lamp. TEST NO. 1 4 : R e s t o r i n g t h e RELAY A k e y removes h o l d ing ground f o r r e l a v A i n t h e f i n d e r . R e l a y A r e " " s t o r e s and c l o s e s g;ound t o t h e f i n d e r RLS . - m a g n e t . Nagnet RLS. o p e r a t e s and r e l e a s e s t h e f i n d e r . When t h e V . O . N . s p r i n g s r e s t o r e , t h e RLS. magnet i s opened, g r o u n d i s removed from s w i t c h j a c k t e r m i n a l 9 , and g r o u n d i s p l a c e d on s w i t c h j a c k t e r m i n a l 1 3 . The GUARD lamp g o e s d a r k , and t h e ATB lamp l i g h t s . T h i s t e s t assures the r e l e a s e of r e l a y A i n p - r e -p a r a t i o n f o r succeeding t e s t s . TEST NO. 15: T h i s t e s t i s a r e p e t i t i o n o f t e s t s 5 and 7 ; o p e r a t i o n s a r e a s p r e v i o u s l y d e s c r i b e d . A 1 6 : O p e r a t i n g t h e RELAY D k e y opens t h e c i r c u i t t o t h e C GRD. lamp, e x t i n g u i s h i n g t h i s lamp, and p l a c e s ground c)n s w i t c h j a c k t e r m i n a l 1 7 , t h e r e b y c l o s i n g a c i r c u i t t o r e l a y D i n t h e f i n d e r . Relay D o p e r a t e s and p l a c e s ground on s w i t c h j a c k t e r m i n a l 9 , l i g h t i n g t h e GUARD lamp. TEST NO. ----- O p e r a t i n g t h e RELAY A k e y p l a c e s ground on s w i t c h j a c k t e r m i n a l 1 8 , b u t r e l a y A i n t h e f i n d e r d o e s n o t o p e r a t e b e c a u s e a s e t of b r e a k c o n t a c t s on t h e o p e r a t e d r e l a y D have opened t h e c i r c u i t t o {/LA. TEST NO. 1 7 : ----- TEST NO.--1 8 : T h i s t e s t i s t h e same a s t e s t 1 0 e x c e p t t h a t b r c a k s p r i n g s on r e l a y D i n s t e a d o f r e l a y A now open t h e c i r c u i t t o t h e ROT. magnet. T h i s t e s t i s t h e same a s t e s t 11 exc c p t t h a t r e l a y P i n s t e a d of r e l a y A remains o p e r a t e d . TEST NO.-1 9 : -- TEST KO. 2 0 :- S h o r t i n g t h e lower l i n e w i p e r s l i g h t s t h e SEL. S E I Z E lamp, i n d i c a t i n g c o n t i n u i t y from s w i t c h j z c k t e r m i n a l s 1 and 2 t h r o u g h two s e t s o f make cont a c t s on r e l a y D i n t h e f i n d e r . TEST NO. 21: Touching t h e b a t t e r y - c o n n e c t e d test l a m i p r o d t h e l o d e r C w i ~ e rl i g h t s t h e t e s t lam^. ~ r o h dp l a c e d on s w i t c h j a c k t e r m i n a l 3 by t h e ope;a t c d REIAY D k e y t o h o l d r e l a y D o p e r a t e d i n t h e f i n d e r i s e x t e n d e d t h r o u g h two s e t s o f make c o n t a c t s on r e l a y D t o t h e lower C w i p e r , t h e r e b y c o m p l e t i n g t h e c i r c u i t t o t h e t e s t lamp. TEST NO. 2 2 : S h o r t i n g t h e LOWER BANK TEST J A C K on t h e i i n t f e r l i g h t s t h e LBL lam^. i n d i c a t i n g c i r c u i t c o n t i n u i t y w i t h i n t h e f i n d e r ?;om s w i t c h j a c k termi n a l 16 t h r o u g h c o n t a c t s o f t h e lower bank t e s t j a c k , r e l a y D , t h e V . O . N . s p r i n g s , busy k e y , r e l a y B , and relay A. TEST NO. 2 3 : T h i s t e s t i s t h e same a s t e s t 1 4 exc e p t t h a t r e l a y D now p e r f o r m s t h e f u n c t i o n s d e s c r i b ed f o r r e l a y A . ->-.a . . t r - KUE I DRAWltiG KO. f M2(U lII/(o - -- E- 85289 .I-,"-CQlp TEST NO. 24: T h i s t e s t i s a r e p e t i t i o n o f t e s t s 5 and 7 ; o p e r a t i o n s a r e as p r e v i o u s l y d e s c r i b e d . TEST NO. 25: O p e r a t i n g t h e ROT. INT. k e y c l o s e s c i r c u i t s o v e r s w i t c h j a c k t e r m i n a l s 10 and 14 ( l e a d s ROT. and INT.) t o s t e p t h e s w i t c h r o t a r y u n d e r c o n t r o l o f t h e ROT. magnet i n t h e f i n d e r and t h e INT. r e l a y i n t h e s w i t c h t e s t s t a n d . On t h e e l e v e n t h r o t a r y s t e p t h e cam s p r i n g s i n t h e f i n d e r o p e r a t e and e i t h e r p l a c e b ~ q t t e r yon t h e TEST 1 l e a d ( F i g . 2 u s e d ) , o r p l a c e ground on t h e GUAKD l e a d ( F i g . 3 u s e d ) . In e i t h e r c a s e , t h e STP r e l a y o p e r a t e s and opens t h e s t e p p i n g c i r c u i t t o t h e ROT. magnet, s t o p p i n g t h e switch a t the eleventh s t e p ; and, i n t h e l a t t e r case, l i g h t s t h e GUARD lamp. TEST NO. 26: With t h e START and ROT. INT. k e y s --r e s t o r e d . ~ r o u n di s removed from s w i t c h i a c k t e r m i n a l 8, openinguthe c i r c u i t t o r e l a y B i n thedfinder. Kelay R r e s t o r e d , c l o s e s t h e c i r c u i t t o t h e RLS. magnet, and c l o s e s ground t h r o u g h t h e V . O . N . s p r i n g s t o s ~ f i i t c hj a c k t e r m i n a l 9. The s w i t c h r e l e a s e s a n d , a f t c r t h e V . O . N . s p r i n g s r e s t o r e , t h e GUARD lamp g o e s d a r k and t h e ATB lamp l i g h t s . VERT. MAC. and ROT. MAG. - keys a r e used t o s t e p t h e s w i t c h manually t o any d e s i r e d p o s i t i o n . Each o p e r a t i o n o f t h e s e k e y s p l a c e s grounh on s w i t c h j a c k ierrni n a l s 4 o r 1 0 s t e p p i n g t h e s w i t c h one s t e p v e r t i c a l l y o r rotary. Lamp EC i s p r o v i d e d t o check NORMAL POST s p r i n g o p e r a - t l o n on l i n e f i n d e r s a r r a n g e d f o r d i s c r i m i n a t i n g s e r v i c e marking i n a c c o r d a n c e w i t h NOTE 2 on H-85289. B i n d i n g P o s t s a r e p r o v i d e d on l e a d s e x t e n d i n g t o s w i t c h magnets ; l i e l a y s f o r c o n v e n i e n t u s e o f c u r r e n t flow t e s t s e t o r r e s i s t a n c e box f o r a d j u s t m e n t p u r p o s e s . B. T e s t P r o c e d u r e 1 - FIG 4A H-85289) 1. T e s t No. 1 ( s e e NOTES 2 & 4 ; The Testman c o n n e c t s t h e j a c k s o f t h e L i n e F i n d e r i n t o t h e Switch T e s t Stand Shelf Jacks, l i g h t i n g lamp ATB & LBL t o i n d i c a t e t h e L i c e Z i n d e r i s i n it.s n o r m a l s t a t e . 2. T e s t No. 2 (Operated: Lamp ATB & LBL) The Testman o p e r a t e s t h e busy k e y i n t h e L i n e F i n d e r , e x t i n g u i s h i n g lamp ATB & LBL and 1 j . g h t i n g lamp GUARD v i a l e a d GUARD. T h i s i n d i c a t e s t h e p r o p e r o p e r a t i o n o f t h e busy k e y . 3 J . Te s t No. 3 (Operated: Lamp GUARD) The busy k e y o f t h e L i n e F i n d e r i s r e s t o r e d , l i g h t i n g l a ~ p ATH & LEL and e x t i n g u i s h i n g lamp GUARD; t h e Testman r a i s e s t h e s w i t c h s h a f t t o r e s t o r e t h e VON s p r i n g s , which upon r e s t o r i n g , e x t i n g u i s h lamp ATB & LRL a n d l i g h t s lamp GUARD. This i s an i n d i c a t i o n o f t h e p r o p e r o p e r a t i o n o f t h e VON s p r i n g s . The s w i t c h s h a f t i s retrurned t o n o r m a l , o p e r a t i n g t h e VON s p r i n g s , w h i c h upon o p e r a t i n g , e x t i n g u i s h lamp GUARD and l i g h t s l a m p ATU & LBT.. 4. T e s t No. 4 (Operated: NOTE 1; H-85289) Lamp ATB & LBL) (see The Testmnn m o m e n t a r i l y o p e r a t e s k e y RLY LB, t r a n s f e r r i n g l e a d C froin r e s i s t a n c e (lamp C GRD) b a t t e r y t o ground, c l o s i n g an a s s o c i a t e d r e l a y i n the Line F i n d e r , which upon o p e r a t i n g , l i g h t s lamp GUARD, and e x t i n g u i s h e s lamp ATB & LBL. I n a d d i t i o n , on c e r t a i n L i n e F i n d e r s ( s e e NOTE 1; H-85289), lamp EXT GUARD i s lit v i a l e a d FBG when k e y RLY LB i s opera t e d . When key RLY LB i s r e s t o r e d , ground i s removed from l e a d C , o p e n i n g a n a s s o c i a t e d r e l a y , which upon r e s t o r i n g , e x t i n g u i s h e s lamp GUARD (and lamp EXT GUARD i? l i t ) and l i g h t s lamp ATB & LBL. 5. T e s t No. 5 (Operated: Lamp ATB & LBL) The Testman o p e r a t e s k e y START t o e i t h e r t h e BAT SEIZE o r LOOP SEIZE p o s i t i o n ( d e p e n d i n g on s e i z u r e o f s u c c e e d i n g e q u i p m e n t ; s e e NOTE 5 ; H-85289). \,!hen t h e L i n e F i n d e r i s w i r e d f o r ba:tery s e i z u r e , key START i s o p e r a t e d t o t h e EAT SEIZE p o s i t i o n , g r o u n d i n g l e a d F ST t o c l o s e an a s s o c i a t e d r e l a y , which upon o p e r a t i n g , l i g h t s lamps C GRD and EXT GUARD, e x t i n g u i s h e s lamp ATB & LBL, c l o s e s #lTR v i a r e s i s t a n c e b a t t e r y o n l e a d +L, and c o n n e c t s t h e u p p e r C w i p e r and lower C w i p e r t o l e a d s TEST 1 and TEST 2 , respectively. R e l a y TR o p e r a t e s t o i t s "X" c o n t a c t s , l o c k s v i a i t s /I2 w i n d i n g , o p e r a t e s f u l l y , and o p e n s // ITR . When t h e L i n e F i n d e r i s w i r e d f o r l o o p s e i z u r e , k e y START i s o p e r a t e d t o t h e LOOP SEIZE p o s i t i o n , and the remaining operations a r e s i m i l a r t o t h e p r e c e d i n g p a r a g r a p h w i t h t h e e x c e p t i o n t h a t lamp SEL SEIZE i s d i m l y l i t and r e l a y TR does n o t o p e r a t e . 6. T e s t No. 6 ( O p e r a t e d : R e l a y TR o r lamp SEL SEIZE and lamps EXT GUARD and C GRD) T h e Testman c o n n e c t s r e s i s t a n c e (TEST WPIP I N TEST PRO9) b a t t e r y JTa NEG TEST PROD t o t h e v e r t l c a l r i p e r and e a c h C w i p e r o f t h e L i n e F i n d e r ; t h e l i g h t i n g o f lamp TEST LAMP I N TEST PROD i n d i c a t e s t h a t e a c h C w i p e r and v e r t i c a l w i p e r i s p r e p a r e d f o r f u r t h e r t e s t i n g of t h e i r respective l e v e l s . 7. T e s t No. 7 ( O p e r a t e d : R e l a y TR o r lamp SEL SEIZE and lamps EXT GUARD and C GRD) 7.1 V e r t i c a l I n t e r r u p t e r Break S p r i n g s The Testman m o m e n t a r i l y o p e r a t e s k e y VERT INT t o c l o s e r e l a y VS. R e l a y VS o p e r a t e s . When k e y VERT INT i s r e s t o r e d , r e l a y VS i s opened, //21N1 i s c l o s e d v i a l e a d INT and t h e i n t e r r u p t e r s p r i n g s o f t h e v e r t i c a l magnet i n t h e L i n e F i n d e r . R e l a y VS r e mains o p e r a t e d due t o i t s s l o w - t o - r e l e a s e c h a r a c t e r i s t i c s . R e l a y I N 1 o p e r a t e s and c o n n e c t s ground t o l e a d VERT t o c l o s e t h e v e r t i c a l magnet. The o p e r a t i o n o f t h e v e r t i c a l magnet s t e p s t h e w i p e r s and opens I N 1 v i a i n t e r r u p t e r s p r i n g s . R e l a y I N 1 r e s t o r e s and o p e n s t h e v e r t i c a l magnet. The v e r t i c a l magnet r e s t o r e s and r e s t o r e s i t s interrupter s p r i n g s , c l o s i n g #21Nl. Relay I N 1 o p e r a t e s and c o n n e c t s ground t o l e a d VERT t o c l o s e t h e v e r t i c a l magnet. T h i s c y c l i c o p e r a t i o n c o n t i n u e s and t h e switch s t e p s v e r t i c a l t o the 5th l e v e l o r higher. A f t e r i t s s l o w - t o - r e l e a s e interval, r e l a y VS r e s t o r e s , removes ground from l e a d VERT t o open t h e v e r t i c a l magnet o r opens ik2iN1 ( i f o p e r a t e d ) . Rel a y 1x1 r e s t o r e s . T h i s c h e c k s t h e o p e r a t i o n o f t h e i n t e r r u p t e r s p r i n g s and v e r t i c a l s t e p p i n g . 7.2 --! 7 e r t i c a l ' I n t e r r u p t e r Make S p r i n g s The Testmsu momentarily o p e r a t e s k e y VERT INT t o c l o s e rel-ay VS. Relay V S o p e r a t e s . When k e y VERT IXT, i s r e s t o r e d , ground i s c o n n e c t e d t o l e a d VERT c l o s i c g t h c v e r t i c a l magnet and r e l a y VS i s opened. R e l a y \'S r e m a i n s o p e r a t e d due t o i t s s l o w - t o - r e l e a s e c h s r ~ c t e r i s t i c s . The v e r t i c a l magnet o p e r a t e s , o p e r a r s s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g r e l a y IN2 via lcac! I N ' T and s t e p s t h e w i p e r s t o t h e n e x t l e v e l . R e l , ? : 1x2 o p e r a t e s and removes ground from l e a d llEk'T. ~ p i n mg t h e v e r t i c a l magnet ; t h e v e r t i c a l v:c;-.L t r e s t o r e s and r e s t o r e s i t s i n t e r r u p t e r s p r i n g s , o?c.nll.g r e l a y ~ N L . Relay 1N2 r e s t o r e s and c o n n e c t s $--ound t o l e a d VERT t o c l o s e t h e v e r t i c a l magnet. The v e r t i c a l magnet o p e r a t e s , s t e p s i t s w i p e r s t o t : ~ en e s t l e v e l and o p e r a t e s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g r e l a y 1N2. T h i s c y c l i c o p e r a t i o n c o n t i n u e s and t h e s r l i t c h s t e p s v e r t i c a l t o t h e f i f t h l e v e l o r higl?'r. After i t s slow-to-release i n t e r v a l , r e l a y VS r e s t o r e s , removes ground from l e a d VERT t o open t h e v e r t i c a l magnet o r opens r e l a y 1N2 ( i f o p e r a t e d ) . R e l a y 1x2 r e s t o r e s . T h i s c h e c k s t h e o p e r a t i o n o f t h e i n t e r r u p t e r s p r i n g s and v e r t i c a l s t e p p i n g . - 8. T e s t No. 8 ( O p e r a t e d : Relay TR o r lamp SEL SEIZE, and lamps C GRD and EXT GRD) The Testman o p e r a t e s k e y RLY U B , t r a n s f e r r i n g l e a d C from r e s i s t a n c e (lamp C GRD) b a t t e r y t o g r o u n d , e x t i n g u i s h i n g lamp C GRD ( i f l i t ) , and c o n n e c t s g r o u n d t o l e a d UB t o c l o s e a n a s s o c i a t e d r e l a y , w h i c h upon o p e r a t i n g , c o n n e c t s w i p e r s and " - ' I t o l e a d s +L and -L, r e s p e c t i v e l y , and l i g h t s lamps EXT GUARD a n d GUARD ( i f n o t l i t ) "+" 9. T e s t No. 9 (200 l i n e s ) ( O p e r a t e d : R e l a y TR o r lamp SEL SEIZE, and lamps EXT GUARD and GUARD) DIIAWIIiG NO. E- 85289 FNPZ (ID60 The Testman m o m e n t a r i l y o p e r a t e s k e y RLY LB, c o n n e c t i n g g r o u n d t o l e a d LB. N o t e , a t t h i s t i m e i n t e r v a l , t h e r e l a y a s s o c i a t e d w i t h l e a d LB s h o u l d n o t o p e r a t e . 10. T e s t 9 (100 l i n e s ) o r T e s t 10 (200 l i n e s ) ( O p e r a t e d : R e l a y TR o r lamp SEL SEIZE and lamps EXT GUARD and GUARD) The Testman m o m e n t a r i l y o p e r a t e s key ROT INT, c l o s i n g ]I1 and jI21N1 i n s e r i e s v i a l e a d INT, and t r a n s f e r r i n g l e a d s TEST 1 and TEST 2 from ground t o r e s i s t a n c e (!I1 and !I2 STP) g r o u n d . R e l a y I N 1 o p e r a t e s and g r c u n d c l e a d ROT. When k e y INT TPANS i s o p e r a t e d , t h e o p e r a t i o n o f k e y ROT INT c o n n e c t s ground t o l e a d ROT. In e i t h e r c a s e , t h e wipers should not o p e r a t e when k?y ROT INT i s o p e r a t e d , i n d i c a t i n g the proper operation of the associated r e l a y closed i n S e c t i o n 8. \<hen t h e Testman r e s t o r e s k e y ROT INT, ground i s rcmovcd f:om l e a d ROT ( i f k e y INT TRANS i s o p e r a t e d ) o r TEST 2 and TEST 1 a r e t r a n s f e r r e d from r e s i s t a n c e (/I1 and 8 2 STP) ground t o ground and #1 and #21N1 i s opened. R e l a y I N 1 r e s t o r e s and removes ground from l e a d ROT. 11. T e s t 1 0 (100 l i n e s ) o r T e s t 11 (200 l i n e s ) ( O p e r a t e d : R e l a y TR o r lamp SEL SEIZE, and iamps EXT GUARD and GUARD) The Testrnan may now r e s t o r e k e y START from e i t h e r t h e BAT SEIZE p o s i t i o n o r LOOP SEIZE p o s i t i o n (dependi n g on s e i z u r e o f s u c c e e d i n g e q u i p m e n t , s e e NOTE 5 ; H-85289). When k e y START i s r e s t o r e d from t h e LOOP SEIZE p o s i t i o n , ground i s removed from l e a d RLY U R , and ground i s removed from l e a d F ST, openi n g a n a s s o c i a t e d r e l a y , which upon r e s t o r i n g , r e moves r e s i s t a n c e ground from l e a d + L , e x t i n g u i s h i n g lamp SEL SEIZE. The Testman r e s t o r e s key START from t h e BAT SEIZE p o s i t i o n , o p e n i n g #2TR, removing ground from l e a d U B , and removing ground from l e a d F ST, o p e n i n g a n a s s o c i a t e d r e l a y , which r e s t o r e s . R e l a y TR r e s t o r e s . 12. T e s t 11 (100 l i n e s ) o r T e s t 12 (200 l i n e s ) ( O p e r a t e d : Lamps EXT GUARD and GUARD) The Testnian s h o r t - c i r c u l t s t h e l i n e w i p e r s ( u p p e r l i n e w i p e r s f o r 200 l i n e s ) , l i g h t i n g lamp SEL SEIZE t o i n d i c a t e the proper operation of the associated r e l a y ( c l o s e d i n S e c t i o n 8 ) i n c o n n e c t i n g l e a d s +L and -L t o t h e w i p e r s I f + " and " - I f , respectively. 13. T e s t No. 12 (100 l i n e s ) o r T e s t No. 1 3 (200 l i n e s 1 ( O p e r a t e d : Lamps EXT GUARD and GUARD) The T e s t n ? a r ? c c r m e c t s r e s i s t a n c e ( l ~ i i i pTEST LAMP I N TCS'I' P::C)I)) b a t t e r y t o t h e C w i p e r o f t h e L i n e F i n d e r v i a t h e TEST PROD, l i g n t i n g lamp TEST LAMP I N TEST Yl?OD, i n d i c a t i n g tlie o p e r a t i o n o f t h e a s s o c i a t e d r e l a y ( c l o s e d i n S e c t i o n 8) h a s c o n n e c t e d ground t o w i p e r C ( u p p e r l i n e w i p e r C f o r 200 l i n e s ) . 14. -- T c s t No. 13 (130 l i n e s ) o r T e s t No. 1 4 (200 l i n e s ) (Oper,lt..d: Lamps EXT GUARD and GUARD) -,---- The Testman r e s t o r e s key RLY UB, removing ground fro111 l e a d C , o p e n i n g t h e a s s o c i a t e d r e l a y ( c l o s e d i n S e c t i o n 8 ) , which, upon r e s t o r i n g , e x t i n g u i s h e s lamp EST GUARD and c l o s e s t h e r e l e a s e magnet. The r e l e a s e magnet o p e r a t e s t o r e s t o r e t h e s w i t c h and t h e L i n e F1-nder t o i t s normal c o n d i t i o n , l i g h t s lamp ATB & LBL, and e x t i n g u i s h e s lamp GUARD. 15. T e s t No. 1 5 ( 2 0 0 l i n e s ) ( O p e r a t e d : Lamp ATB & LBL) The Testman o p e r a t e s key START t o e i t h e r t h e BAT S E I Z E o r LOOP SEIZE p o s i t i o n and f u r t h e r o p e r a t i o n s a r e t h e same a s S e c t i o n 5. The Testman m o m e n t a r i l y o p e r a t e s key VERT INT and f u r t h e r operation i s a s d e s c r i b e d i n S e c t i o n 7 . Ke_s_t ? ; o . 16 (200 L i n e s ) ( O p e r a t e d : R e l a y TR o r l a n p SEL SEIZE, and lamps C GRD and EXT GUARD) The T e s t n a n o p e r a t e s k e y RLY LB, c o n n e c t i n g ground t o i e a d LB t o c l o s e a n a s s o c i a t e d r e l a y , w h i c h , upon o p e r a t i n g , li h t s lam GUARD and c o n n e c t s t h e l o g e = bank w i p e r s '+" and t o l e a d s +L and -I,, 16. - DRAWING NO. E~85289 -.-*r.V.s-< .-m.--.% r e s p e c t i v e l y , and t r a n s f e r s l e a d C from r e s i s t a n c e ( l a m p C GRD) b a t t e r y t o g r o u n d , e x t i n g u i s h i n g lamp C GKD. 17. T e s t No. 17 ( 2 0 0 l i n e s ) ( O p e r a t e d : R e l a y TR o r lamp SEL S E I Z E , a c d lamps EXT GUARD a n d GUARD) The Testman n i o m e n t ~ r i l yo p e r a t e s k e y RLY UB, c o n n e c t i n g ground t o l e a d UB. Xote, a t t h i s time, t h e a s s o c i a t e d r e l a y w i t h l e a d CB s h o u l d n o t o p e r a t e a t t h i s time . 18. -e s t No. 1 8 (200 f i i n e s ) ( O p e r a t e d : R e l a y TR T o r lamp SEL S E I Z E , and lamps EXT GUARD a n d GUARD) The Testman mornentnrily o p e r a t e s k e y ROT INT a n d f u r t h e r o p e r a t i o n s a r e t h e same a s S e c t i o n 1 0 . 19. E y t No. 1 9 (200 l t n e s ) The o p e r a t i o n ! . a r e s i m i l a r t o S e c t i o n - l L a h rhe f o l i o w i n g e::ccption when k e y START i s r e s t o r e d , g r o u n d i s removed from l e a d LB. - 20. ~-e s t?do. 20 (200 l i n e s ) EXT GUARD a n d GUARD) (Operated: Lamps The o p e r a t i o n s a r e s i m i l a r t o S e c t i o n 1 2 w i t h t h e exc e p t i o n t h a t t h e Testman s h o r t - c i r c u i t s t h e l o w e r l i n e wipers t o indicate the proper operation of the a s s o c i a t e d r e l a y (closed i n Section 16). 21. T e s t N o . 2 1 (200 l i n e s ) EXT GUARD a n d GUARD) (Operated: Lamps The o p e r a t i o n s a r e s i m i l a r t o S e c t i o n 1 3 w i t h t h e exception t h a t the associated operated r e l a y i n the L i n e F i n d e r was c l o s e d i n S e c t i o n 1 6 . 22. T e s t No. 2 2 (200 l i n e s ) EXT GUARD a n d GUARD) (Operated: Lamps The Testman m o m e n t a r i l y i n s e r t s a s h o r t i n g p l u g i n t o t h e l o w e r bank t e s t j a c k o f t h e a s s o c i a t e d L i n e F i n d e r , l i g h t i n g lamp ATB 6 LBL. T-e s t No. .. 2 3 (200 l i n e s ) EXT G U A R D and GUARD) 23. (Operated: Lamps The Testman r e s t o r e s k e y RLY LB, removing ground from l e a d C t o open t h e a s s o c i a t e d r e l a y ( c l o s e d i n S e c t i o n 1 6 ) , w h i c h , ilpon r e s t o r i n g , c l o s e s t h e r e l e a s e magnet. The r e l e a s e magnet o p e r a t e s t o r e s t o r e t h e s w i t c h and t h e L i n e F i n d e r t o i t s normal c o n d i t i o n , e x t i n g u i s h e s lamps EXT GUARD and GUARD, and l i g h t s laalp ATB & LBL. 24. 'Test h?o. 111 (10@ l i n e s ) o r T e s t No. 24 (200 1 s ) (Operaced: Lainp ATB & LBL) 8 The TcsCnlan o p e r a t e s k e y START and f u r t h e r o p e r a t i o n i s t h e same a s S e c t i o n 5. '!he 'Testman mornentartly o p e r a t e s k e y VERT INT and f u r ~ h e ro p e r a t i - o n i s t h e same a s S e c t i o n 7. 25. 25.1 T c - t N o . 15 (100 l i n e s ) o r T e s t No. 25 (200 1 i 1 1 9 ( O p e r a t e d : Relay TR o r lamp SEL S E I Z E 'and lamps C GRD and EXT GUARD) A - Int -e-r r u p t e r Break S p r i n g s The Testman o p e r a t e s key ROT INT, c l o s i n g #1 and # 2 1 N 1 i n s e r i e s v i a l e a d INT and t r a n s f e r r i n g l e a d s TEST 1 and TEST 2 from ground t o r e s i s t a n c e ( # I and 8 2 S'TP) ground. Relay 1 N 1 o p e r a t e s and g r o u n d s l e a d ROT t o c l o s e t h e r o t a r y magnet. The r o t a r y magnet o p e r a t e s , r o t a t e s i t s w i p e r s and o p e r a t e s i t s i n t e r r u p t e r s p r i n g s , o p e n i n g /I1 and #21N1, Relay I N 1 r e s t o r e s and removes ground from l e a d ROT t o open t h e r o t a r y magnet. The r o t a r y magnet r e s t o r e s and r e s t o r e s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g #1 and 821Nl i n s e r i e s v i a l e a d INT. Rel a y I N 1 o p e r a t e s and c o n n e c t s ground t o l e a d ROT t o c l o s e t h e r o t a r y magnet. T h i s c y c l e c o n t i n u e s u n t i l the switch steps t o the eleventh rotary s t e p , ~ , h c r et h e cam s p r i n g s o p e r a t e , c l o s i n g r e l a y STP v i a l e a d TEST 1. R e l a y STP o p e r a t e s and removes g r o u n d from l e a d ROT, o p e n i n g t h e r o t a r y magnet. The r o t a r y magnet r e s t o r e s , and r e s t o r e s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g /I1 and #21N1 i n s e r i e s . Relay 1 N 1 operates. 25.2 I n t e r r u p t e r Make -S p r i n g s When k e y INT TRANS i s o p e r a t e d , t h e o p e r a t i o n o f k e y ROT INT, c o n n s c t s ground t o l e a d ROT t o c l o s e t h e r o t a r y magnet. The r o t a r y magnet o p e r a t e s and r o t a t e s t h e w i p e r s t o t h e n e x t s t e p and o p e r a t e s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g r e l a y 1N2 v i a l e a d INT. R e l a y IN2 o p e r a t e s and removes ground from l e a d ROT, o p e n i n g t h e r o t a r y magnet. The r o t a r y magnet r e s t o r e s and r e s t o r e s i t s i n t e r r u p t e r s p r i n g s , o p e n i n g r e l a y 1N2. Relay IN2 r e s t o r e s and c o n n e c t s t o l e a d R3T t o c l o s e t h e r o t a r y magnet. T h i s c y c l i c operation continues u n t i l the switch s t e p s t o t h e e l e v e n t h r o t a r y p o s i t i o n , where t h e cam s p r i n g s o p e r a t e , c l o s i n g r e l a y STP v i a l e a d GUARD. R e l a y STP o p e r a t e s a n d removes ground from l e a d ROT, openi n g t h e r o t b r y magnet. The r o t a r y magnet r e s t o r e s and r e s t o r e s i t s i n t e r r u p t e r s p r i n g s , c l o s i n g r e l a y 1N2. Relay IN2 o p e r a t e s . 26. T e s t No. 1 5 (100 l i n e s ) o r T e s t No. 25 (200 lines) ( O p e r a t e d : R e l a y s I N 1 o r 1N2, STP and^ o r lamp SEL SEIZE, lamp C GRD a n d EXT GUARD) The Testman r e s t o r e s k e y ROT INT, o p e n i n g r e l a y STP and # 1 and iI21Nl ( o r r e l a y 1N2 i f k e y INT TRANS i s o p e r a t e d ) and t r a n s f e r r i n g l e a d s TEST 1 and TEST 2 from r e s i s t a n c e (/I1 and 412 STP) ground t o g r o u n d . R e l a y s I N 1 ( o r IN2 i f o p e r a t e d ) and STP r e s t o r e . The Testman r e s t o r e s k e y START and f u r t h e r o p e r a t i o n s a r e t h e same a s S e c t i o n 11. - FIG 4A ( s e e NOTES 2 & 4 ; C. Test Procedure 2 H-85289) . 1. D i s c r i m i n a t i n g Markings With Normal P o s t S p r i n g s 1.1 Test N a . 1 (Operated: Lamp ATB & LBL) The Testman o p e r a t e s t h e busy key i n t h e L i n e F i n d e r , e x t i n g u i s h i n g lamp ATB & LBL and 1Cghting lamp GUABD. 1.2 T e s t No. 2 (Operated: Lamp GUARD) The Testman o p e r a t e s k e y START t o e i t h e r t h e BAT SEIZE o r LOOP SEIZE p o s i t i o n (depending on a c c e s s o f s u c c e e d i n g equipment, s e e NOTE 5 ; H-85289). When key START 2s o p e r a t e d t o t h e BAT SEIZE p o s i t i o n , ground v i a l e a d F ST c l o s e s a n a s s o c i a t e d r e l a y , which upon o p e r n t i n g , c l o s e s #1TR v i a r e s i s t a n c e b a t t e r y on l e a d +L, e x t i n g u i s h e s lamp GUARG, and l i g h t s lamp C GRD and EXT GUARD. R e l a y TR o p e r a t e s t o i t s "XI' c o n t a c t s , l o c k s - ~ i ai t s #2 w i n d i n g , o p e r a t e s f u l l y . When t h e Testman o p e r a t e s k e y START t o t h e LOOP SEIZE p o s i t i o n , ground i s c o n n e c t e d t o l e a d F ST t o o p e r a t e a n a s s o c i a t e d r e l a y , which upon o p e r a t i n g , dimly l i g h t i n g la1 p SEL SEIZE, e x t i n g u i s h i n g lamp GUARD, a n d l i g h t s lamp C GRD and EXT GUARD. When t h e Testman i s o n l y i n t e r e s t e d i n t e s t i n g t h e l e f t normal p o s t springs, f u r t h e r operations a r e a s described i n Section 1.6. 1.3 -. T e s t No. 3 ( R i g h t Normal P o s t S p r i n g s ) (Opera t e d : ~ e x a yTR o r lamp SEL SEIZE and lamps C GRD a n d EXT GUARD) The Testman o p e r a t e s k e y RLY LB, e x t i n g u i s h i n g lamp C GKD, c o n n e c t s ground t o l e a d LB t o c l o s e a n a s s o c i a t e d r e l a y , which upon o p e r a t i n g , l i g h t s lamp GUARD. The Testman o p e r a t e s k e y EC CK, t r a n s f e r s l e a d MR from ground t o r e s i s t a n c e (iI1TR) g r o u n d , c o n n e c t s l e a d EC w i t h l e a d MR, c o n n e c t s r e s i s t a n c e (i11TR) ground and r e s i s t a n c e (#2TR) b a t t e r y t o l e a d EC, c l o s i n g #lTR i n m a g n e t i c o p p o s i t i o n t o #2TR, and e x t i n g u i s h e s lamp SEL SEIZE. R e l a y TR r e s t o r e s . 1.4. T e s t No. 4 ( R i g h t Normal P o s t S p r i n g s ) a t e d : Lamps GUARD and EXT GUARD) (Oper- The Testman o p e r a t e s k e y VERT MAG, c o n n e c t i n g ground t o l e a d VERT t o c l o s e t h e v e r t i c a l magnet. The v e r t i c a l magnet o p e r a t e s and s t e p s i t s w i p e r s . Key VERT MAG i s r e s t o r e d , removing ground from l e a d VERT t o open t h e v e r t i c a l magnet. The Testmnn c o n t i n u e s t h e o p e r a t i o n o f k e y VERT MAG u n t i l t h e l e v e l f o r t h e o p e r a t i o n o f t h e r i g h t normal p o s t s p r i n g s i s r e a c h e d , whereby r e s i s t a n c e ground ( d i s c r i m i n a t i n g mark) v i a l e a d EC c l o s e s #2TR and s h o r t - c i r = u i t s #I.TK. R e l a y TR o p e r a t e s t o i t s "X" c o n t a c t s , o p e r a t e s f u l l y and l i g h t s lamp EC&ECl t o i n d i c a t e t h e d i s c r i m i n a t i n g mark v i a t h e r i g h t n o r m ~ lp o s t s p r i n g s . 1.5 T e s t No. 5 ( R i g h t Normal P o s t S p r i n g s ) (Opera t e d : R e l a y TR and lamps GUARD, EXT GUARD and EC&EC1 ) T h e Testman r e s t o r e s key START from e i t h e r t h e LOOP SEIZE o r BAT SEIZE p o s i t i o n , ground i s removed from l e a d LB, and ground i s removed from l e a d F ST, openi n g a n a s s o c i a t e d r e l z y , which upon r e s t o r i n g , c l o s e s #1TR i n m a g n e t i c o p p o s i t i o n t o 1/2TR. R e l a y TR r e s t o r e s and e x t i n g u i s h e s lamp EC&ECl. When t h e T e s t man r e s t o r e s k e y RLY LB, ground i s removed from l e a d C, e s t i n g u i s h i n g lamp EXT GUARD, and opens t h e a s s o c i a r e d r e l a y , ~ h i c hr e s t o r e s . Key EC CK i s r e s t o r e d , o p e n i n g 111 and #2TR. 1.6 T e s t No. 3 ( L e f t Normal P o s t S p r i n g s ) (Opera t e d : R e l a y TR o r lamp SEL SEIZE, and lamps C GRD and EXT GUARD) The Testman o p e r a t e s k e y RLY TJB, t r a n s f e r r i n g . 1 e a d C from r e s i s t a n c e (lamp C GRD) b a t t e r y t o g r o u n d , e x t i n g u i s h i n g lamp C r G R D , and c l o s e s a n a s s o c i a t e d r e l a y , which upon o p e r a t i n g , l i g h t s lamp GUARD SEIZE. The Testman o p e r a t e s k e y EC CK, c o n n e c t i n g r e s i s t a n c e (#lTR) ground and r e s i s t a n c e (1/2TR) b a t t e r y t o l e a d EC, c l o s i n g #1 and l/2TR i n m a g n e t i c o p p o s i t i o n and e x t i n g u i s h e s lamp SEL SEIZE. R e l s y TR restores . 1.7 T e s t No. 4 ( L e f t Normal P o s t S p r i n g s ) a t e d : LampsEXT GUARD and GUARD) (Oper- The Testman o p e r a t e s k e y VERT MAG and f u r t h e r o p e r a t i o n is s i m i l a r t o Section 1.4 with the exception t h a t t h e l e f t normal p o s t s p r i n g s o p e r a t e t o conn e c t t h e d i s c r i m i n a t i n g mark t o l e a d EC. 1.8 T e s t No. 5 ( L e f t Normal P o s t S p r i n g s ) (Opera t e d : R e l a y TR and lamps GUARD., EXT GUARD and EC&ECl) When k e y START i s r e s t o r e d , o p e r a t i o n s a r e s i m i l a r t o S e c t i o n 1 . 5 w i t h t h e e x c e p t i o n t h a t ground i s removed from l e a d UR ( r a t h e r t h a n l e a d LB). When t h e Testman r e s t o r e s key RLY UB, ground i s removed from l e a d C , e x t i n g u i s h i n g lamp EXT GUARD, and opens t h e a s s o c i a t e d r e l a y , which r e s t o r e s . 1.9 Test KO. 6 (Operated: Lamp GUARD) When the Testman r e s t c r e s t h e busy k e y i n t h e L i n e F i n d e r , c l o s i n g t h e r e l e a s e magnet t o r e l e a s e t h e s w i t c h s h a f t . The r e l e a s e magnet o